Invasive Species Northern Ireland

Giant ramshorn snail

Marisa cornuarietis

Status:

Potential

Habitat:

Freshwater

Threats:

Threatens aquatic ecosystems consuming large amounts of vegetation, preying on eggs of, and competing with, native species.

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Golden mussel

Limnoperna fortunei

Status:

Potential

Habitat:

Freshwater

Threats:

Fouls pipes, filters and intakes of water works. Colonises native bivalves and displaces native species. Increases algal blooms

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Gyrodactylus salaris

Status:

Potential

Habitat:

Freshwater

Threats:

Serious negative impacts on salmonid stocks.

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Killer shrimp

Dikerogammarus villosus

Status:

Potential

Habitat:

Freshwater

Threats:

Efficient predator. Adapatable to new freshwater systems. Highly mobile.

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Large-flowered waterweed

Egeria densa

Status:

Potential

Habitat:

Freshwater

Threats:

Competition with native plants, shading and blocking waterways, eutrophication and reduction of biodiversity

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Marbled crayfish

Procambarus fallax f. virginalis

Status:

Potential

Habitat:

Freshwater

Threats:

Potential threat of native crayfish. Potential threat to wetlands by extensive burrowing activities.

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Narrow-clawed crayfish

Pontastacus leptodactylus

Status:

Potential

Habitat:

Freshwater

Threats:

Can impact habitat structure and outcompete native crayfish

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Noble crayfish

Astacus astacus

Status:

Potential

Habitat:

Freshwater

Threats:

Negatively impact habitat structure with burrows, reduce native species, competition with native crayfish

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North American signal crayfish

Pacifastacus leniusculus

Status:

Potential

Habitat:

Freshwater

Threats:

Detrimental impacts on white clawed crayfish. Human health impacts.

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